VB.639-B - Knob with brass boss, threaded blind hole
Glass-fibre reinforced polyamide based (PA) technopolymer.
VB.639/130: glass-fibre reinforced polypropylene based (PP) technopolymer. Resistant to solvents, oils, greases and other chemical agents.
Black, matte finish.
VB.639-A: black-oxide steel boss, plain blind hole.
VB.639-B: brass boss, threaded blind hole.
VB.639-FP: brass boss, threaded pass-through hole.
VB.639-p: zinc-plated steel threaded stud with chamfered flat end as in UNI 947 : ISO 4753 (seeTechnical data on page -).
VB.639-SST: AISI 303 stainless steel boss, threaded blind hole.